6 papers
Boron-doped diamond
Vassiliki Katsika-Tsigourakou
Boron-doped diamond undergoes an insulator-metal transition at some critical value (around 2.21 at %) of the dopand concentration. Here, we report a simple method for the calculati…
Multiphased alkali halide mixed crystals: The conductivity activation energy
Vassiliki Katsika-Tsigourakou, Chrysoleon Symeonidis
The preparation of mixed crystals of NaBr and KBr from melt as well as their physical characterization have been reported. Electrical measurements were carried out at various tempe…
The dielectric constant of Na_{0.4}K_{0.6}Br and its large temperature variation
V. Katsika-Tsigourakou, P. Bekris
Since polycrystals of alkali halides are highly useful as components in optical devices, a number of mixed crystals of NaBr and KBr have been prepared from melt by other workers. A…
(NaCl)_x(KCl)_{y-x}(KBr)_{1-y} single crystals: study of the ac conductivity activation energy
Vassiliki Katsika-Tsigourakou
Ac electrical measurements have been reported for alkali halide mixed crystals that were melt grown from NaCl, KCl and KBr starting materials. They showed a nonlinear variation of…
A tentative model for estimating the compressibility of rock-salt AgCl_{x}Br_{1-x} alloys
V. Katsika-Tsigourakou, E. S. Skordas
Ab initio detailed calculations of the elastic properties of AgCl_{x}Br_{1-x} alloys recently appeared using density-functional perturbation theory and employing the virtual crysta…
Heterodiffusion coefficients in α-iron
V. Katsika-Tsigourakou, E. S. Skordas
The diffusion of tungsten in α-iron is important for the application of ferritic-iron alloys to thermal power plants. These data, over a wide temperature range across the Curie tem…